Frederic george johnson and alfred johnson



(No Model.)

F. G. & A. JOHNSOIL LINK PRESS FOR MAKING BARTHBNWA-RE, -&c. No.349,432. I Patented Sept. 21; 1886.

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- UNIT D STATES PATENT OFFICE.

FREDERIO GEORGE JOHNSON AND ALFRED JOHNSON, OF HANLEY, COUNTY OFSTAFFORD, ENGLAND.

LINK-PRESS FOR MAKING EARTHENWARE, 80C.

SPECIFICATION forming part of Letters Patent No. 349,432, datedSeptember 21, 1886.

Application filed July 13, 1886. Serial No. 207,870. (No model.)Patented in England March 31, 1885, No. 4,060.

To all whom it may concern.-

Be'it known that we, FREDERIO GEORGE JOHNSON and ALFRED JOHNSON, bothsubjects of the Queen of Great Britain, and residents of Hanley, in thecounty of Stafford, England, have jointly invented certain Improvementsin Link-Presses for Making Earthenware, &c., (for which we have beengranted a patent in Great Britain,dated March 31, 1885, No. 4,060,) ofwhich the following is a specification.

Our invention relates to that class of presses known as link-presses,wherein a toggle or linkis employed.

The press herein described is primarily designed for use in themanufacture of earthenware; and the principal object of our invention isto provide means whereby the movement of the ram, and consequently theamount of pressure on the article being mold-ed, may be regulated.

In the drawing which serves to illustrate our invention the press isrepresented in side elevation.

A represents a substantial frame mounted on a base, 13.

G is a bracket, fixed by screws or bolts a a to the upright of frame A.This bracket has a cap, 0, secured to it by screws 1) b, and in thebracket and its cap is formed the guide in which plays the ram D of thepress. IVe have not deemed it necessary to show the mold or die, whichissecured to the end of the ram, but removably, so that it may beconveniently removed and replaced.

E is the fulcrum of the toggle, which is formed on the end of a screw,E, which passes through the upper part of frame A, and is provided withjam or look nuts 0 0, whereby thefulcrum may be adjusted and set upordown, as required. I

F E are the links of the toggle, coupled, re spectively, to the fulcrumE at m and to the ram D at 1 To the knuckle z of the toggle is coupled aconnecting-rod, G, the other end of which is coupled to an arm, H, on arock-shaft, I, mounted in brackets on the frame A.

To the shaft I is secured an operating-lever, J, on the short arm J ofwhich is adjustablymounted a counterpoise, K, of sulficient weight toraise the ram and balance the other parts. A set-screw, d, in the frameA serves to limit the movement in this direction by engaging the arm H.Any stop device may be employed for this purpose. bracket to show thestop-screw d.

The fulcrum is adjusted and set up or down by the nuts 0 to suit thework to be done, and when the lever J is depressed it acts throughshaftLarm H, and conneeting-rodJ to straight 6c en the toggle anddepressthe ram D. When the links F of the toggle are brought to astraight line, the ram will have reached the extreme point of itsdownward movement, and any further movement of the lever J will 6 5 onlyserve to relieve the pressure by lifting or retracting the ram. Now, bysetting the fulcrum E lower down, the ram'may be made to move fartherdown before it begins to lift, and, conversely, by setting the fulcrumhigher up, the end or limit of the downward movement of the ram will becorrespondingly raised. Thus by means of nuts 0 the limit of thedownward travel or movement of the ram may be exactly defined anddetermined to suit the class of work, and nothing is left to thejudgment or discretion of the operator, who may be unskilled.

\Ve do not limit ourselves to the precise construction of the frame-workand parts of our press, as these may be varied somewhat Within theknowledge of a skilled workman without departing materially from ourinvention.

Having thus described our invention, We 8 5 claim- 1. The combination,with the mm D and its guide, of the fulcrum-screw mounted in the frameof the press, the adjusting-nuts c c on said fulcrum-screw, and thelinks F F, congo neeted together at z and to the fulcrum-screw and ram,respectively, at .90 and a all arranged to operate substantially as setforth.

2. The combination, with the ram D and its 'We have broken away the 5 5r guide, of the fulcrum-screw mounted in the frame of the press, the adjListing-nuts 0 c on said fulcrum-screw, the links F F, connected to saidfulcrum-screw and ram, the shaft I 5 provided with an arm, H, the rod G,connecting arm H with the links F F at z, the operatinglever J, attachedto shaft I, and means for retracting the parts and throwing back saidlever, substantially as set forth.

m In witness whereof we have hereunto signed our names in the presenceof two subscribing witnesses.

FREDERIG GEORGE JOHNSON. ALFRED JOHNSON.

1 Witnesses:

WILLIAM ADAMS CoWLIsI-IAW, HENRY HoWLE'r'r, Clerks to llfessrs. Paddock& Son's, Solicitors,

Hcmley, Stcqflord.

